Ah, glad the mystery's solved! And sorry for the misdirection. On Sun, Dec 31, 2017 at 11:38 AM, Yahya Abou 'Imran < yahya-abou-im...@protonmail.com> wrote:
> > >>>I guess a PR to fix the registry output would make sense (first file a > bug onbugs.python.org for it). > >> > >>Ok, I will! > >> > >> > >> > >Please don't hurry with this. I am going to rewrite ABCMeta in C soon. > >In fact most of the work is done but I am waiting for implementation of > PEP 560 to settle (need few more days for this). > > > >In the C version the caches/registry will be simpler and will not use > WeakSet (instead they will be thin C wrappers around normal sets). > > Ok, no problem. > > Found out myself why the registry's empty: > every iterator passed to Iterator.register() defines __iter__ and > __next__, so they satisfy Iterator.__subclasshook__ and are added to the > cache beforehand. > -- --Guido van Rossum (python.org/~guido)
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